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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b1541153e8cb6716a6f9284f624a941abe1de0d6bdce9da5674de5622732312' 
  AND token = 'SFVSXLP1RSzXcFSyvCxvo9/FMCdLDhNvBToA25cDm0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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