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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '967249bde60793c6e8cad720bd1ee258d4abdec2f548c04efd1051051530cdbf' 
  AND token = 'dz/zD3X+uEBm5OUgjafrCLcytGm9ehTG/BNdwkAcH4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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