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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f563fc5fb095f0959d1af0601d9166f6e58b453f52aad1b204a874bab22a9827' 
  AND token = '7ytY86m5aAeHTnS3C2exN9fRTzrcf+CuNqtUxjO4pQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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