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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7344661df3d7970b367d2539e50513d486714b56b4e602f45c732f172e4467c0' 
  AND token = 'OWG1nhfVKIkVq2RI5hz26vKIUCR/fVfNfzmV/I4SELU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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