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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcdabf0ecd91218d69d87172b640910cc98c9f9d8c8a9d25de652338c78203ed' 
  AND token = '9RD7S9mGD5ycpYV/2zMXtI3/EQcMqc+50Rv3cL/RIKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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