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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd427bb21f6c6ebb366b1e19812f4849f8b1dc5e29794340bb9e0c6efc8940ea3' 
  AND token = 'QIZvFbsqFZgedvUl1OrOLeVP3gJRI+T9NAfJUfnlVHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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