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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e77b921a60cf8da7da4dd1c1102a116116b4560431b78743ea901cf2977a6cd4' 
  AND token = 'Kwx+MFKLRWrSuHS2uzVHAnC66QPaYABtoJgkC6Fx88w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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