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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda903ffc91cf52ccbf9654e825ff9614b2b679719853bd1c2158a2778642fa0' 
  AND token = '60KPInA4RtiLLfxPByd1i3SKF0aV8W2ghvT9FSzyOZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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