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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec7a917b4350d8289ae65e6ee709d8ae9d4be5508efc47285c18bbd23a37847a' 
  AND token = 'ePzYk4b0j/hgepdXYnYU/OboTdjf2qMiyn7KpB3O3Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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