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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71d6a1f77cafdd1da4c5b57e3e03609ec734c66f3a9d052b8fbc37b95622abbf' 
  AND token = 'c20575uj/8r1D4QedWck5EbQC75gtQ5FB+oELeZJITE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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