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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b07f561643a3345515685bc96fac4a5b0c7aae8c47d3549a1a033ca7e1632b9e' 
  AND token = 'fCmyJsLu66NQTc4Cz3A+6GCYjWKWpBAKdPE+6IhSu8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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