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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da99a32dc768bde9f40d7009a5c0ec0aa834146bb04240ddf2bf9e9cb4e8e5f5' 
  AND token = 'Cou3+P1+Bn6D4BkKQCCnYdsta1LP6uflo+SBuYPMpU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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