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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe661e34e687f33aadd13a8501b38f392dcdc357fd558f7dbd85fed29bfb06c' 
  AND token = 'vI+/STq5htSNu+OW+Hz/UcA3ld9sxrb3z7lACYtxrJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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