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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9af0c1619baecbdba90afcc2925179953d2df1b55d8f8c5a2849d014b49684e' 
  AND token = 'h3kkbcDmMpLysJa2B4qWFebtRGHbT7sLQEvokuvSbKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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