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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9ed873bf5949bb71c9e5424043c4450cd5a9a03609ef1c914a9971ecdc60d0b' 
  AND token = '0Do52I6H8qM8yOO2EGRHfSfRSAXLxB7DF1S6OXi4Kn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}